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Units Markup Language (UnitsML)

UnitsML is a project underway at the National Institute of Standards and Technology (NIST) to develop a schema for encoding scientific units of measure in XML. Furthermore, a database (UnitsDB) containing extensive information about scientific units is under development.

We have initiated an OASIS Technical Committee to address any needed changes in the schema and publish a final recommendation.
OASIS TC teleconference — Tuesday September 16, 2008, 10:00 am - 12:00 p.m. EDT (UTC -4 hours):
  • Toll-free call-in number: 800-779-9040
  • International call-in number: 1-415-228-3904
  • Passcode: 61049
Asynchronous participation will be open from 12:00 pm EDT on Tuesday September 16, 2008 until 5:00 pm EDT on Tuesday September 30, 2008.

Additional information:

  1. Two-page Description (May 2006; PDF 173 kB)

  2. FAQs (February 2007)

  3. Documentation, Draft schema, and changes for UnitsML, Ver. 0.9.13. (September 2008)

  4. Overview slides used in the 1st OASIS TC Meeting, July 12, 2006 (PDF 470 kB)

  5. "Improving Interoperability by Incorporating UnitsML into Markup Languages" (July 2006; preprint; PDF 0.9 MB)

  6. UnitsDB Entity Relationship Model

  7. UnitsML presentation (Jan 2003; PPT 450 kB)

For further information, contact Bob Dragoset.


This project is supported in part by NIST's Systems Integration for Manufacturing Applications (SIMA) Program.

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Online: May 2003  -   Last update: September 2008


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